How your data is stored

By default, your Rune 1 health data never leaves your phone. The ring sends sensor readings to the Pulsyn app over Bluetooth. Storage, analysis, and AI insights all happen on your device.

On-device by default

When you use Rune 1 without a Pulsyn Pro subscription, or with Pro but cloud sync turned off:

• Raw sensor data stays on your phone.
• Computed metrics such as Sleep Score, Readiness, HRV, SpO2, and Body Battery are calculated locally.
• North AI runs on-device, so your questions and answers do not travel to a remote server.
• Journal entries are stored on-device only and are never synced, even for Pro subscribers. See Using the Journal for details.

We architecturally cannot access this data because we never receive it. The architecture enforces this, independently of any policy.

What is encrypted on your phone

Health data on your phone is encrypted at rest. The app stores biometric data in an encrypted local database, so another app on your phone cannot simply read it.

What can leave your device

Two things can leave your phone, and only if you explicitly opt in:

1. Cloud sync (Pulsyn Pro): encrypted backups for cross-device access.
2. Cloud AI requests (Pulsyn Pro): relevant context sent to generate an answer and not retained.

Both are covered in Pro cloud sync and encryption.

What does not change when you upgrade to Pro

Unless you turn on cloud sync, a Pro subscription does not move your historical health data off your phone. Your default state stays local. You control the switch.